using System;
using System.Collections;

namespace Org.BouncyCastle.Asn1.Ocsp
{
	public class CrlID
		: Asn1Encodable
	{
		private readonly DerIA5String		crlUrl;
		private readonly DerInteger			crlNum;
		private readonly DerGeneralizedTime	crlTime;

		// TODO Add GetInstance method(s) and amke this private?
		public CrlID(
			Asn1Sequence seq)
		{
			foreach (Asn1TaggedObject o in seq)
			{
				switch (o.TagNo)
				{
				case 0:
					crlUrl = DerIA5String.GetInstance(o, true);
					break;
				case 1:
					crlNum = DerInteger.GetInstance(o, true);
					break;
				case 2:
					crlTime = DerGeneralizedTime.GetInstance(o, true);
					break;
				default:
					throw new ArgumentException("unknown tag number: " + o.TagNo);
				}
			}
		}

		public DerIA5String CrlUrl
		{
			get { return crlUrl; }
		}

		public DerInteger CrlNum
		{
			get { return crlNum; }
		}

		public DerGeneralizedTime CrlTime
		{
			get { return crlTime; }
		}

		/**
		 * Produce an object suitable for an Asn1OutputStream.
		 * <pre>
		 * CrlID ::= Sequence {
		 *     crlUrl               [0]     EXPLICIT IA5String OPTIONAL,
		 *     crlNum               [1]     EXPLICIT Integer OPTIONAL,
		 *     crlTime              [2]     EXPLICIT GeneralizedTime OPTIONAL }
		 * </pre>
		 */
		public override Asn1Object ToAsn1Object()
		{
			Asn1EncodableVector v = new Asn1EncodableVector();

			if (crlUrl != null)
			{
				v.Add(new DerTaggedObject(true, 0, crlUrl));
			}

			if (crlNum != null)
			{
				v.Add(new DerTaggedObject(true, 1, crlNum));
			}

			if (crlTime != null)
			{
				v.Add(new DerTaggedObject(true, 2, crlTime));
			}

			return new DerSequence(v);
		}
	}
}
